Voltage: Measurement range: 80 ~ 260V. Resolution: 0.1V.Measurement accuracy: 0.5% Current.Measuring range: 0 ~ 10A (PZEM-004T-10A); 0 ~ 100A (PZEM-004T-100A).Initial measurement current: 0.01A (PZEM-004T-10A); 0.02A (PZEM-004T-100A).Resolution: 0.001A.Measurement accuracy: 0.5% Active power:Measuring range: 0 ~ 2.3kW (PZEM-004T-10A); 0 ~ 23kW (PZEM-004T-100A).Initial measurement power:0.4W.Resolution: 0.1W.Display format:Less than1000W, display one decimal place, for example: 999.9W. equal1000W, only display whole numbers, for example: 1000W Measurement accuracy: 0.5%<br><br>Power factor: Measurement range: 0.00 ~ 1.00 Resolution: 0.01 Measurement accuracy: 1% Frequency Measuring range: 45Hz ~ 65Hz Resolution: 0.1Hz Measurement accuracy: 0.5% Active energy Measuring range: 0 ~ 9999.99kWh Resolution: 1Wh Measurement accuracy: 0.5% Display format: Less than10kWh, display unit is Wh (1kWh = 1000Wh), for example: 9999Wh equal10kWh, display unit is kWh, for example: 9999.99kWh Reset energy: Use software reset. Power failure alarm:You can set the active power threshold. When the measured active power exceeds the threshold,Can report to police Communication Interface:TTL Colour: green Material: plastic + metal Size: 73x30mm<br><br>Package Contents: 1 * Ammeter 1 * Closed CT 1 * TTL to USB adapter cable<br><br>Only the above package content, other products are not included. Note: Light and different displays may cause the color of the item in the picture a little different from the real thing. The measurement allowed error is +/- 1-3cm.